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Service overprint - Postage stamp overprinted (with the word 'service' or the initials of a military force) for exclusive use by military personnel, often outside the country of issue.
: On State Service overprint on Feudatory State of Travancore, India officials.
On S.S.S.: On Sirmoor State Service, overprint for Feudatory State of Sirmoor, India official, 1885.
 See also: Packet, Army, Perforations, Applied, Ship letter
  
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